Yealink SIP-T46G Administrator's Guide

Administrator’s Guide for SIP-T46G IP Phone
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SIP provides the capabilities to:
 Determine the location of the target endpoint -- SIP supports address resolution,
name mapping, and call redirection.
 Determine the media capabilities of the target endpoint -- Via Session Description
Protocol (SDP), SIP determines the ―lowest level‖ of common services between the
endpoints. Conferences are established using only the media capabilities that can
be supported by all endpoints.
 Determine the availability of the target endpoint -- A call cannot be completed
because the target endpoint is unavailable, SIP determines whether the called
party is already on the IP phone or did not answer in the allotted number of rings. It
then returns a message indicating why the target endpoint was unavailable.
 Establish a session between the origin and target endpoint -- The call can be
completed, SIP establishes a session between the endpoints. SIP also supports
mid-call changes, such as the addition of another endpoint to the conference or the
changing of a media characteristic or codec.
 Handle the transfer and termination of calls -- SIP supports the transfer of calls from
one endpoint to another. During a call transfer, SIP simply establishes a session
between the transferee and a new endpoint (specified by the transferring party)
and terminates the session between the transferee and the transferring party. At
the end of a call, SIP terminates the sessions between all parties.
SIP is a peer-to-peer protocol. The peers in a session are called User Agents (UAs). A
user agent can function as one of the following roles:
 User Agent Client (UAC) -- A client application that initiates the SIP request.
 User Agent Server (UAS) -- A server application that contacts the user when a SIP
request is received and that returns a response on behalf of the user.
User Agent Client (UAC)
The UAC is an application that initiates up to six feasible SIP requests to the UAS. The six
requests issued by the UAC are: INVITE, ACK, OPTIONS, BYE, CANCEL and REGISTER.
When the SIP session is being initiated by the UAC SIP component, the UAC determines
the information essential for the request, which is the protocol, the port and the IP
address of the UAS to which the request is being sent. This information can be dynamic
and this will make it challenging to put through a firewall. For this reason it may be
recommended to open the specific application type on the firewall. The UAC is also
capable of using the information in the request URI to establish the course of the SIP
request to its destination, as the request URI always specifies the host which is essential.
The port and protocol are not always specified by the request URI. Thus if the request
does not specify a port or protocol, a default port or protocol is contacted. Using this

Yealink SIP-T46G Specifications

General

Backlight	Yes
Power requirements	100-240V, DC 5V
Touchscreen	-
Display diagonal	4.3 \
Display resolution	480 x 272 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Voice codecs	G.711, G.722, G.723, G.726, G.729A, G.729B
Bluetooth	No
RJ-9 ports quantity	2
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Ethernet LAN (RJ-45) ports	1
Storage temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	185 mm
Width	244 mm
Height	213 mm